4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
14 * Split from inode.c by David Howells <dhowells@redhat.com>
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
50 #include <linux/nfs_xdr.h>
51 #include <linux/magic.h>
52 #include <linux/parser.h>
54 #include <asm/system.h>
55 #include <asm/uaccess.h>
59 #include "delegation.h"
63 #define NFSDBG_FACILITY NFSDBG_VFS
66 /* Mount options that take no arguments */
69 Opt_posix, Opt_noposix,
74 Opt_udp, Opt_tcp, Opt_rdma,
76 Opt_rdirplus, Opt_nordirplus,
77 Opt_sharecache, Opt_nosharecache,
79 /* Mount options that take integer arguments */
81 Opt_rsize, Opt_wsize, Opt_bsize,
82 Opt_timeo, Opt_retrans,
83 Opt_acregmin, Opt_acregmax,
84 Opt_acdirmin, Opt_acdirmax,
91 /* Mount options that take string arguments */
92 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
93 Opt_addr, Opt_mountaddr, Opt_clientaddr,
95 /* Mount options that are ignored */
96 Opt_userspace, Opt_deprecated,
101 static match_table_t nfs_mount_option_tokens = {
102 { Opt_userspace, "bg" },
103 { Opt_userspace, "fg" },
104 { Opt_soft, "soft" },
105 { Opt_hard, "hard" },
106 { Opt_intr, "intr" },
107 { Opt_nointr, "nointr" },
108 { Opt_posix, "posix" },
109 { Opt_noposix, "noposix" },
111 { Opt_nocto, "nocto" },
113 { Opt_noac, "noac" },
114 { Opt_lock, "lock" },
115 { Opt_nolock, "nolock" },
120 { Opt_rdma, "rdma" },
122 { Opt_noacl, "noacl" },
123 { Opt_rdirplus, "rdirplus" },
124 { Opt_nordirplus, "nordirplus" },
125 { Opt_sharecache, "sharecache" },
126 { Opt_nosharecache, "nosharecache" },
128 { Opt_port, "port=%u" },
129 { Opt_rsize, "rsize=%u" },
130 { Opt_wsize, "wsize=%u" },
131 { Opt_bsize, "bsize=%u" },
132 { Opt_timeo, "timeo=%u" },
133 { Opt_retrans, "retrans=%u" },
134 { Opt_acregmin, "acregmin=%u" },
135 { Opt_acregmax, "acregmax=%u" },
136 { Opt_acdirmin, "acdirmin=%u" },
137 { Opt_acdirmax, "acdirmax=%u" },
138 { Opt_actimeo, "actimeo=%u" },
139 { Opt_userspace, "retry=%u" },
140 { Opt_namelen, "namlen=%u" },
141 { Opt_mountport, "mountport=%u" },
142 { Opt_mountvers, "mountvers=%u" },
143 { Opt_nfsvers, "nfsvers=%u" },
144 { Opt_nfsvers, "vers=%u" },
146 { Opt_sec, "sec=%s" },
147 { Opt_proto, "proto=%s" },
148 { Opt_mountproto, "mountproto=%s" },
149 { Opt_addr, "addr=%s" },
150 { Opt_clientaddr, "clientaddr=%s" },
151 { Opt_mounthost, "mounthost=%s" },
152 { Opt_mountaddr, "mountaddr=%s" },
158 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
163 static match_table_t nfs_xprt_protocol_tokens = {
164 { Opt_xprt_udp, "udp" },
165 { Opt_xprt_tcp, "tcp" },
166 { Opt_xprt_rdma, "rdma" },
168 { Opt_xprt_err, NULL }
172 Opt_sec_none, Opt_sec_sys,
173 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
174 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
175 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
180 static match_table_t nfs_secflavor_tokens = {
181 { Opt_sec_none, "none" },
182 { Opt_sec_none, "null" },
183 { Opt_sec_sys, "sys" },
185 { Opt_sec_krb5, "krb5" },
186 { Opt_sec_krb5i, "krb5i" },
187 { Opt_sec_krb5p, "krb5p" },
189 { Opt_sec_lkey, "lkey" },
190 { Opt_sec_lkeyi, "lkeyi" },
191 { Opt_sec_lkeyp, "lkeyp" },
193 { Opt_sec_err, NULL }
197 static void nfs_umount_begin(struct vfsmount *, int);
198 static int nfs_statfs(struct dentry *, struct kstatfs *);
199 static int nfs_show_options(struct seq_file *, struct vfsmount *);
200 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
201 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
202 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
203 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
204 static void nfs_kill_super(struct super_block *);
205 static void nfs_put_super(struct super_block *);
207 static struct file_system_type nfs_fs_type = {
208 .owner = THIS_MODULE,
210 .get_sb = nfs_get_sb,
211 .kill_sb = nfs_kill_super,
212 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
215 struct file_system_type nfs_xdev_fs_type = {
216 .owner = THIS_MODULE,
218 .get_sb = nfs_xdev_get_sb,
219 .kill_sb = nfs_kill_super,
220 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
223 static const struct super_operations nfs_sops = {
224 .alloc_inode = nfs_alloc_inode,
225 .destroy_inode = nfs_destroy_inode,
226 .write_inode = nfs_write_inode,
227 .put_super = nfs_put_super,
228 .statfs = nfs_statfs,
229 .clear_inode = nfs_clear_inode,
230 .umount_begin = nfs_umount_begin,
231 .show_options = nfs_show_options,
232 .show_stats = nfs_show_stats,
236 static int nfs4_get_sb(struct file_system_type *fs_type,
237 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
238 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
239 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
240 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
241 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
242 static void nfs4_kill_super(struct super_block *sb);
244 static struct file_system_type nfs4_fs_type = {
245 .owner = THIS_MODULE,
247 .get_sb = nfs4_get_sb,
248 .kill_sb = nfs4_kill_super,
249 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
252 struct file_system_type nfs4_xdev_fs_type = {
253 .owner = THIS_MODULE,
255 .get_sb = nfs4_xdev_get_sb,
256 .kill_sb = nfs4_kill_super,
257 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
260 struct file_system_type nfs4_referral_fs_type = {
261 .owner = THIS_MODULE,
263 .get_sb = nfs4_referral_get_sb,
264 .kill_sb = nfs4_kill_super,
265 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
268 static const struct super_operations nfs4_sops = {
269 .alloc_inode = nfs_alloc_inode,
270 .destroy_inode = nfs_destroy_inode,
271 .write_inode = nfs_write_inode,
272 .statfs = nfs_statfs,
273 .clear_inode = nfs4_clear_inode,
274 .umount_begin = nfs_umount_begin,
275 .show_options = nfs_show_options,
276 .show_stats = nfs_show_stats,
280 static struct shrinker acl_shrinker = {
281 .shrink = nfs_access_cache_shrinker,
282 .seeks = DEFAULT_SEEKS,
286 * Register the NFS filesystems
288 int __init register_nfs_fs(void)
292 ret = register_filesystem(&nfs_fs_type);
296 ret = nfs_register_sysctl();
300 ret = register_filesystem(&nfs4_fs_type);
304 register_shrinker(&acl_shrinker);
309 nfs_unregister_sysctl();
312 unregister_filesystem(&nfs_fs_type);
318 * Unregister the NFS filesystems
320 void __exit unregister_nfs_fs(void)
322 unregister_shrinker(&acl_shrinker);
324 unregister_filesystem(&nfs4_fs_type);
326 nfs_unregister_sysctl();
327 unregister_filesystem(&nfs_fs_type);
330 void nfs_sb_active(struct nfs_server *server)
332 atomic_inc(&server->active);
335 void nfs_sb_deactive(struct nfs_server *server)
337 if (atomic_dec_and_test(&server->active))
338 wake_up(&server->active_wq);
341 static void nfs_put_super(struct super_block *sb)
343 struct nfs_server *server = NFS_SB(sb);
345 * Make sure there are no outstanding ops to this server.
346 * If so, wait for them to finish before allowing the
347 * unmount to continue.
349 wait_event(server->active_wq, atomic_read(&server->active) == 0);
353 * Deliver file system statistics to userspace
355 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
357 struct nfs_server *server = NFS_SB(dentry->d_sb);
358 unsigned char blockbits;
359 unsigned long blockres;
360 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
361 struct nfs_fattr fattr;
362 struct nfs_fsstat res = {
369 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
372 buf->f_type = NFS_SUPER_MAGIC;
375 * Current versions of glibc do not correctly handle the
376 * case where f_frsize != f_bsize. Eventually we want to
377 * report the value of wtmult in this field.
379 buf->f_frsize = dentry->d_sb->s_blocksize;
382 * On most *nix systems, f_blocks, f_bfree, and f_bavail
383 * are reported in units of f_frsize. Linux hasn't had
384 * an f_frsize field in its statfs struct until recently,
385 * thus historically Linux's sys_statfs reports these
386 * fields in units of f_bsize.
388 buf->f_bsize = dentry->d_sb->s_blocksize;
389 blockbits = dentry->d_sb->s_blocksize_bits;
390 blockres = (1 << blockbits) - 1;
391 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
392 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
393 buf->f_bavail = (res.abytes + blockres) >> blockbits;
395 buf->f_files = res.tfiles;
396 buf->f_ffree = res.afiles;
398 buf->f_namelen = server->namelen;
404 dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
410 * Map the security flavour number to a name
412 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
414 static const struct {
415 rpc_authflavor_t flavour;
418 { RPC_AUTH_NULL, "null" },
419 { RPC_AUTH_UNIX, "sys" },
420 { RPC_AUTH_GSS_KRB5, "krb5" },
421 { RPC_AUTH_GSS_KRB5I, "krb5i" },
422 { RPC_AUTH_GSS_KRB5P, "krb5p" },
423 { RPC_AUTH_GSS_LKEY, "lkey" },
424 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
425 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
426 { RPC_AUTH_GSS_SPKM, "spkm" },
427 { RPC_AUTH_GSS_SPKMI, "spkmi" },
428 { RPC_AUTH_GSS_SPKMP, "spkmp" },
429 { UINT_MAX, "unknown" }
433 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
434 if (sec_flavours[i].flavour == flavour)
437 return sec_flavours[i].str;
441 * Describe the mount options in force on this server representation
443 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
445 static const struct proc_nfs_info {
450 { NFS_MOUNT_SOFT, ",soft", ",hard" },
451 { NFS_MOUNT_NOCTO, ",nocto", "" },
452 { NFS_MOUNT_NOAC, ",noac", "" },
453 { NFS_MOUNT_NONLM, ",nolock", "" },
454 { NFS_MOUNT_NOACL, ",noacl", "" },
455 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
456 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
459 const struct proc_nfs_info *nfs_infop;
460 struct nfs_client *clp = nfss->nfs_client;
462 seq_printf(m, ",vers=%d", clp->rpc_ops->version);
463 seq_printf(m, ",rsize=%d", nfss->rsize);
464 seq_printf(m, ",wsize=%d", nfss->wsize);
465 if (nfss->acregmin != 3*HZ || showdefaults)
466 seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
467 if (nfss->acregmax != 60*HZ || showdefaults)
468 seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
469 if (nfss->acdirmin != 30*HZ || showdefaults)
470 seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
471 if (nfss->acdirmax != 60*HZ || showdefaults)
472 seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
473 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
474 if (nfss->flags & nfs_infop->flag)
475 seq_puts(m, nfs_infop->str);
477 seq_puts(m, nfs_infop->nostr);
479 seq_printf(m, ",proto=%s",
480 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
481 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
482 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
483 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
487 * Describe the mount options on this VFS mountpoint
489 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
491 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
493 nfs_show_mount_options(m, nfss, 0);
495 seq_printf(m, ",addr=%s",
496 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
503 * Present statistical information for this VFS mountpoint
505 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
508 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
509 struct rpc_auth *auth = nfss->client->cl_auth;
510 struct nfs_iostats totals = { };
512 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
515 * Display all mount option settings
517 seq_printf(m, "\n\topts:\t");
518 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
519 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
520 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
521 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
522 nfs_show_mount_options(m, nfss, 1);
524 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
526 seq_printf(m, "\n\tcaps:\t");
527 seq_printf(m, "caps=0x%x", nfss->caps);
528 seq_printf(m, ",wtmult=%d", nfss->wtmult);
529 seq_printf(m, ",dtsize=%d", nfss->dtsize);
530 seq_printf(m, ",bsize=%d", nfss->bsize);
531 seq_printf(m, ",namelen=%d", nfss->namelen);
534 if (nfss->nfs_client->rpc_ops->version == 4) {
535 seq_printf(m, "\n\tnfsv4:\t");
536 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
537 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
538 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
543 * Display security flavor in effect for this mount
545 seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
547 seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);
550 * Display superblock I/O counters
552 for_each_possible_cpu(cpu) {
553 struct nfs_iostats *stats;
556 stats = per_cpu_ptr(nfss->io_stats, cpu);
558 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
559 totals.events[i] += stats->events[i];
560 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
561 totals.bytes[i] += stats->bytes[i];
566 seq_printf(m, "\n\tevents:\t");
567 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
568 seq_printf(m, "%lu ", totals.events[i]);
569 seq_printf(m, "\n\tbytes:\t");
570 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
571 seq_printf(m, "%Lu ", totals.bytes[i]);
574 rpc_print_iostats(m, nfss->client);
580 * Begin unmount by attempting to remove all automounted mountpoints we added
581 * in response to xdev traversals and referrals
583 static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
585 struct nfs_server *server = NFS_SB(vfsmnt->mnt_sb);
586 struct rpc_clnt *rpc;
588 shrink_submounts(vfsmnt, &nfs_automount_list);
590 if (!(flags & MNT_FORCE))
592 /* -EIO all pending I/O */
593 rpc = server->client_acl;
595 rpc_killall_tasks(rpc);
596 rpc = server->client;
598 rpc_killall_tasks(rpc);
602 * Set the port number in an address. Be agnostic about the address family.
604 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
606 switch (sap->sa_family) {
608 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
609 ap->sin_port = htons(port);
613 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
614 ap->sin6_port = htons(port);
621 * Sanity-check a server address provided by the mount command.
623 * Address family must be initialized, and address must not be
624 * the ANY address for that family.
626 static int nfs_verify_server_address(struct sockaddr *addr)
628 switch (addr->sa_family) {
630 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
631 return sa->sin_addr.s_addr != INADDR_ANY;
634 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
635 return !ipv6_addr_any(sa);
643 * Parse string addresses passed in via a mount option,
644 * and construct a sockaddr based on the result.
646 * If address parsing fails, set the sockaddr's address
647 * family to AF_UNSPEC to force nfs_verify_server_address()
650 static void nfs_parse_server_address(char *value,
651 struct sockaddr *sap,
654 if (strchr(value, ':')) {
655 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
656 u8 *addr = (u8 *)&ap->sin6_addr.in6_u;
658 ap->sin6_family = AF_INET6;
660 if (in6_pton(value, -1, addr, '\0', NULL))
663 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
664 u8 *addr = (u8 *)&ap->sin_addr.s_addr;
666 ap->sin_family = AF_INET;
668 if (in4_pton(value, -1, addr, '\0', NULL))
672 sap->sa_family = AF_UNSPEC;
677 * Error-check and convert a string of mount options from user space into
680 static int nfs_parse_mount_options(char *raw,
681 struct nfs_parsed_mount_data *mnt)
684 unsigned short port = 0;
687 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
690 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
692 while ((p = strsep(&raw, ",")) != NULL) {
693 substring_t args[MAX_OPT_ARGS];
699 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
701 token = match_token(p, nfs_mount_option_tokens, args);
704 mnt->flags |= NFS_MOUNT_SOFT;
707 mnt->flags &= ~NFS_MOUNT_SOFT;
713 mnt->flags |= NFS_MOUNT_POSIX;
716 mnt->flags &= ~NFS_MOUNT_POSIX;
719 mnt->flags &= ~NFS_MOUNT_NOCTO;
722 mnt->flags |= NFS_MOUNT_NOCTO;
725 mnt->flags &= ~NFS_MOUNT_NOAC;
728 mnt->flags |= NFS_MOUNT_NOAC;
731 mnt->flags &= ~NFS_MOUNT_NONLM;
734 mnt->flags |= NFS_MOUNT_NONLM;
737 mnt->flags &= ~NFS_MOUNT_VER3;
740 mnt->flags |= NFS_MOUNT_VER3;
743 mnt->flags &= ~NFS_MOUNT_TCP;
744 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
749 mnt->flags |= NFS_MOUNT_TCP;
750 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
755 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
756 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
761 mnt->flags &= ~NFS_MOUNT_NOACL;
764 mnt->flags |= NFS_MOUNT_NOACL;
767 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
770 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
773 mnt->flags &= ~NFS_MOUNT_UNSHARED;
775 case Opt_nosharecache:
776 mnt->flags |= NFS_MOUNT_UNSHARED;
780 if (match_int(args, &option))
782 if (option < 0 || option > 65535)
787 if (match_int(args, &mnt->rsize))
791 if (match_int(args, &mnt->wsize))
795 if (match_int(args, &option))
802 if (match_int(args, &mnt->timeo))
806 if (match_int(args, &mnt->retrans))
810 if (match_int(args, &mnt->acregmin))
814 if (match_int(args, &mnt->acregmax))
818 if (match_int(args, &mnt->acdirmin))
822 if (match_int(args, &mnt->acdirmax))
826 if (match_int(args, &option))
833 mnt->acdirmax = option;
836 if (match_int(args, &mnt->namlen))
840 if (match_int(args, &option))
842 if (option < 0 || option > 65535)
844 mnt->mount_server.port = option;
847 if (match_int(args, &option))
851 mnt->mount_server.version = option;
854 if (match_int(args, &option))
858 mnt->flags &= ~NFS_MOUNT_VER3;
861 mnt->flags |= NFS_MOUNT_VER3;
869 string = match_strdup(args);
872 token = match_token(string, nfs_secflavor_tokens, args);
876 * The flags setting is for v2/v3. The flavor_len
877 * setting is for v4. v2/v3 also need to know the
878 * difference between NULL and UNIX.
882 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
883 mnt->auth_flavor_len = 0;
884 mnt->auth_flavors[0] = RPC_AUTH_NULL;
887 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
888 mnt->auth_flavor_len = 0;
889 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
892 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
893 mnt->auth_flavor_len = 1;
894 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
897 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
898 mnt->auth_flavor_len = 1;
899 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
902 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
903 mnt->auth_flavor_len = 1;
904 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
907 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
908 mnt->auth_flavor_len = 1;
909 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
912 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
913 mnt->auth_flavor_len = 1;
914 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
917 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
918 mnt->auth_flavor_len = 1;
919 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
922 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
923 mnt->auth_flavor_len = 1;
924 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
927 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
928 mnt->auth_flavor_len = 1;
929 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
932 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
933 mnt->auth_flavor_len = 1;
934 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
941 string = match_strdup(args);
944 token = match_token(string,
945 nfs_xprt_protocol_tokens, args);
950 mnt->flags &= ~NFS_MOUNT_TCP;
951 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
956 mnt->flags |= NFS_MOUNT_TCP;
957 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
962 /* vector side protocols to TCP */
963 mnt->flags |= NFS_MOUNT_TCP;
964 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
973 string = match_strdup(args);
976 token = match_token(string,
977 nfs_xprt_protocol_tokens, args);
982 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
985 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
987 case Opt_xprt_rdma: /* not used for side protocols */
993 string = match_strdup(args);
996 nfs_parse_server_address(string, (struct sockaddr *)
997 &mnt->nfs_server.address,
998 &mnt->nfs_server.addrlen);
1001 case Opt_clientaddr:
1002 string = match_strdup(args);
1005 kfree(mnt->client_address);
1006 mnt->client_address = string;
1009 string = match_strdup(args);
1012 kfree(mnt->mount_server.hostname);
1013 mnt->mount_server.hostname = string;
1016 string = match_strdup(args);
1019 nfs_parse_server_address(string, (struct sockaddr *)
1020 &mnt->mount_server.address,
1021 &mnt->mount_server.addrlen);
1026 case Opt_deprecated:
1034 nfs_set_port((struct sockaddr *)&mnt->nfs_server.address, port);
1039 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1043 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1047 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1051 printk(KERN_INFO "NFS: unrecognized security flavor\n");
1055 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1060 * Use the remote server's MOUNT service to request the NFS file handle
1061 * corresponding to the provided path.
1063 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1064 struct nfs_fh *root_fh)
1066 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1070 if (args->mount_server.version == 0) {
1071 if (args->flags & NFS_MOUNT_VER3)
1072 args->mount_server.version = NFS_MNT3_VERSION;
1074 args->mount_server.version = NFS_MNT_VERSION;
1077 if (args->mount_server.hostname)
1078 hostname = args->mount_server.hostname;
1080 hostname = args->nfs_server.hostname;
1083 * Construct the mount server's address.
1085 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1086 memcpy(sap, &args->nfs_server.address,
1087 args->nfs_server.addrlen);
1088 args->mount_server.addrlen = args->nfs_server.addrlen;
1092 * autobind will be used if mount_server.port == 0
1094 nfs_set_port(sap, args->mount_server.port);
1097 * Now ask the mount server to map our export path
1100 status = nfs_mount(sap,
1101 args->mount_server.addrlen,
1103 args->nfs_server.export_path,
1104 args->mount_server.version,
1105 args->mount_server.protocol,
1110 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d",
1116 * Validate the NFS2/NFS3 mount data
1117 * - fills in the mount root filehandle
1119 * For option strings, user space handles the following behaviors:
1121 * + DNS: mapping server host name to IP address ("addr=" option)
1123 * + failure mode: how to behave if a mount request can't be handled
1124 * immediately ("fg/bg" option)
1126 * + retry: how often to retry a mount request ("retry=" option)
1128 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1129 * mountproto=tcp after mountproto=udp, and so on
1131 static int nfs_validate_mount_data(void *options,
1132 struct nfs_parsed_mount_data *args,
1133 struct nfs_fh *mntfh,
1134 const char *dev_name)
1136 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1138 memset(args, 0, sizeof(*args));
1143 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1144 args->rsize = NFS_MAX_FILE_IO_SIZE;
1145 args->wsize = NFS_MAX_FILE_IO_SIZE;
1149 args->acregmax = 60;
1150 args->acdirmin = 30;
1151 args->acdirmax = 60;
1152 args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1153 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1155 switch (data->version) {
1161 if (data->flags & NFS_MOUNT_VER3)
1163 data->root.size = NFS2_FHSIZE;
1164 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1166 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1169 memset(data->context, 0, sizeof(data->context));
1171 if (data->flags & NFS_MOUNT_VER3)
1172 mntfh->size = data->root.size;
1174 mntfh->size = NFS2_FHSIZE;
1176 if (mntfh->size > sizeof(mntfh->data))
1177 goto out_invalid_fh;
1179 memcpy(mntfh->data, data->root.data, mntfh->size);
1180 if (mntfh->size < sizeof(mntfh->data))
1181 memset(mntfh->data + mntfh->size, 0,
1182 sizeof(mntfh->data) - mntfh->size);
1185 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1188 args->flags = data->flags;
1189 args->rsize = data->rsize;
1190 args->wsize = data->wsize;
1191 args->flags = data->flags;
1192 args->timeo = data->timeo;
1193 args->retrans = data->retrans;
1194 args->acregmin = data->acregmin;
1195 args->acregmax = data->acregmax;
1196 args->acdirmin = data->acdirmin;
1197 args->acdirmax = data->acdirmax;
1199 memcpy(&args->nfs_server.address, &data->addr,
1200 sizeof(data->addr));
1201 args->nfs_server.addrlen = sizeof(data->addr);
1202 if (!nfs_verify_server_address((struct sockaddr *)
1203 &args->nfs_server.address))
1204 goto out_no_address;
1206 if (!(data->flags & NFS_MOUNT_TCP))
1207 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1208 /* N.B. caller will free nfs_server.hostname in all cases */
1209 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1210 args->namlen = data->namlen;
1211 args->bsize = data->bsize;
1212 args->auth_flavors[0] = data->pseudoflavor;
1219 if (nfs_parse_mount_options((char *)options, args) == 0)
1222 if (!nfs_verify_server_address((struct sockaddr *)
1223 &args->nfs_server.address))
1224 goto out_no_address;
1226 c = strchr(dev_name, ':');
1230 /* N.B. caller will free nfs_server.hostname in all cases */
1231 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1234 if (strlen(c) > NFS_MAXPATHLEN)
1235 return -ENAMETOOLONG;
1236 args->nfs_server.export_path = c;
1238 status = nfs_try_mount(args, mntfh);
1246 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1247 args->auth_flavors[0] = RPC_AUTH_UNIX;
1249 #ifndef CONFIG_NFS_V3
1250 if (args->flags & NFS_MOUNT_VER3)
1251 goto out_v3_not_compiled;
1252 #endif /* !CONFIG_NFS_V3 */
1257 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1261 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1266 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1269 #ifndef CONFIG_NFS_V3
1270 out_v3_not_compiled:
1271 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1272 return -EPROTONOSUPPORT;
1273 #endif /* !CONFIG_NFS_V3 */
1276 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1280 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1285 * Initialise the common bits of the superblock
1287 static inline void nfs_initialise_sb(struct super_block *sb)
1289 struct nfs_server *server = NFS_SB(sb);
1291 sb->s_magic = NFS_SUPER_MAGIC;
1293 /* We probably want something more informative here */
1294 snprintf(sb->s_id, sizeof(sb->s_id),
1295 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1297 if (sb->s_blocksize == 0)
1298 sb->s_blocksize = nfs_block_bits(server->wsize,
1299 &sb->s_blocksize_bits);
1301 if (server->flags & NFS_MOUNT_NOAC)
1302 sb->s_flags |= MS_SYNCHRONOUS;
1304 nfs_super_set_maxbytes(sb, server->maxfilesize);
1308 * Finish setting up an NFS2/3 superblock
1310 static void nfs_fill_super(struct super_block *sb,
1311 struct nfs_parsed_mount_data *data)
1313 struct nfs_server *server = NFS_SB(sb);
1315 sb->s_blocksize_bits = 0;
1316 sb->s_blocksize = 0;
1318 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1320 if (server->flags & NFS_MOUNT_VER3) {
1321 /* The VFS shouldn't apply the umask to mode bits. We will do
1322 * so ourselves when necessary.
1324 sb->s_flags |= MS_POSIXACL;
1325 sb->s_time_gran = 1;
1328 sb->s_op = &nfs_sops;
1329 nfs_initialise_sb(sb);
1333 * Finish setting up a cloned NFS2/3 superblock
1335 static void nfs_clone_super(struct super_block *sb,
1336 const struct super_block *old_sb)
1338 struct nfs_server *server = NFS_SB(sb);
1340 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1341 sb->s_blocksize = old_sb->s_blocksize;
1342 sb->s_maxbytes = old_sb->s_maxbytes;
1344 if (server->flags & NFS_MOUNT_VER3) {
1345 /* The VFS shouldn't apply the umask to mode bits. We will do
1346 * so ourselves when necessary.
1348 sb->s_flags |= MS_POSIXACL;
1349 sb->s_time_gran = 1;
1352 sb->s_op = old_sb->s_op;
1353 nfs_initialise_sb(sb);
1356 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1358 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1360 const struct nfs_server *a = s->s_fs_info;
1361 const struct rpc_clnt *clnt_a = a->client;
1362 const struct rpc_clnt *clnt_b = b->client;
1364 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1366 if (a->nfs_client != b->nfs_client)
1368 if (a->flags != b->flags)
1370 if (a->wsize != b->wsize)
1372 if (a->rsize != b->rsize)
1374 if (a->acregmin != b->acregmin)
1376 if (a->acregmax != b->acregmax)
1378 if (a->acdirmin != b->acdirmin)
1380 if (a->acdirmax != b->acdirmax)
1382 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1389 struct nfs_sb_mountdata {
1390 struct nfs_server *server;
1394 static int nfs_set_super(struct super_block *s, void *data)
1396 struct nfs_sb_mountdata *sb_mntdata = data;
1397 struct nfs_server *server = sb_mntdata->server;
1400 s->s_flags = sb_mntdata->mntflags;
1401 s->s_fs_info = server;
1402 ret = set_anon_super(s, server);
1404 server->s_dev = s->s_dev;
1408 static int nfs_compare_super_address(struct nfs_server *server1,
1409 struct nfs_server *server2)
1411 struct sockaddr *sap1, *sap2;
1413 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1414 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1416 if (sap1->sa_family != sap2->sa_family)
1419 switch (sap1->sa_family) {
1421 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1422 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1423 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1425 if (sin1->sin_port != sin2->sin_port)
1430 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1431 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1432 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1434 if (sin1->sin6_port != sin2->sin6_port)
1445 static int nfs_compare_super(struct super_block *sb, void *data)
1447 struct nfs_sb_mountdata *sb_mntdata = data;
1448 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1449 int mntflags = sb_mntdata->mntflags;
1451 if (!nfs_compare_super_address(old, server))
1453 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1454 if (old->flags & NFS_MOUNT_UNSHARED)
1456 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1458 return nfs_compare_mount_options(sb, server, mntflags);
1461 static int nfs_get_sb(struct file_system_type *fs_type,
1462 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1464 struct nfs_server *server = NULL;
1465 struct super_block *s;
1466 struct nfs_fh mntfh;
1467 struct nfs_parsed_mount_data data;
1468 struct dentry *mntroot;
1469 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1470 struct nfs_sb_mountdata sb_mntdata = {
1475 /* Validate the mount data */
1476 error = nfs_validate_mount_data(raw_data, &data, &mntfh, dev_name);
1480 /* Get a volume representation */
1481 server = nfs_create_server(&data, &mntfh);
1482 if (IS_ERR(server)) {
1483 error = PTR_ERR(server);
1486 sb_mntdata.server = server;
1488 if (server->flags & NFS_MOUNT_UNSHARED)
1489 compare_super = NULL;
1491 /* Get a superblock - note that we may end up sharing one that already exists */
1492 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1498 if (s->s_fs_info != server) {
1499 nfs_free_server(server);
1504 /* initial superblock/root creation */
1505 nfs_fill_super(s, &data);
1508 mntroot = nfs_get_root(s, &mntfh);
1509 if (IS_ERR(mntroot)) {
1510 error = PTR_ERR(mntroot);
1511 goto error_splat_super;
1514 s->s_flags |= MS_ACTIVE;
1516 mnt->mnt_root = mntroot;
1520 kfree(data.nfs_server.hostname);
1521 kfree(data.mount_server.hostname);
1525 nfs_free_server(server);
1529 up_write(&s->s_umount);
1530 deactivate_super(s);
1535 * Destroy an NFS2/3 superblock
1537 static void nfs_kill_super(struct super_block *s)
1539 struct nfs_server *server = NFS_SB(s);
1542 nfs_free_server(server);
1546 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1548 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1549 const char *dev_name, void *raw_data,
1550 struct vfsmount *mnt)
1552 struct nfs_clone_mount *data = raw_data;
1553 struct super_block *s;
1554 struct nfs_server *server;
1555 struct dentry *mntroot;
1556 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1557 struct nfs_sb_mountdata sb_mntdata = {
1562 dprintk("--> nfs_xdev_get_sb()\n");
1564 /* create a new volume representation */
1565 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1566 if (IS_ERR(server)) {
1567 error = PTR_ERR(server);
1568 goto out_err_noserver;
1570 sb_mntdata.server = server;
1572 if (server->flags & NFS_MOUNT_UNSHARED)
1573 compare_super = NULL;
1575 /* Get a superblock - note that we may end up sharing one that already exists */
1576 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1582 if (s->s_fs_info != server) {
1583 nfs_free_server(server);
1588 /* initial superblock/root creation */
1589 nfs_clone_super(s, data->sb);
1592 mntroot = nfs_get_root(s, data->fh);
1593 if (IS_ERR(mntroot)) {
1594 error = PTR_ERR(mntroot);
1595 goto error_splat_super;
1597 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1600 goto error_splat_super;
1603 s->s_flags |= MS_ACTIVE;
1605 mnt->mnt_root = mntroot;
1607 dprintk("<-- nfs_xdev_get_sb() = 0\n");
1611 nfs_free_server(server);
1613 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
1617 up_write(&s->s_umount);
1618 deactivate_super(s);
1619 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
1623 #ifdef CONFIG_NFS_V4
1626 * Finish setting up a cloned NFS4 superblock
1628 static void nfs4_clone_super(struct super_block *sb,
1629 const struct super_block *old_sb)
1631 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1632 sb->s_blocksize = old_sb->s_blocksize;
1633 sb->s_maxbytes = old_sb->s_maxbytes;
1634 sb->s_time_gran = 1;
1635 sb->s_op = old_sb->s_op;
1636 nfs_initialise_sb(sb);
1640 * Set up an NFS4 superblock
1642 static void nfs4_fill_super(struct super_block *sb)
1644 sb->s_time_gran = 1;
1645 sb->s_op = &nfs4_sops;
1646 nfs_initialise_sb(sb);
1650 * If the user didn't specify a port, set the port number to
1651 * the NFS version 4 default port.
1653 static void nfs4_default_port(struct sockaddr *sap)
1655 switch (sap->sa_family) {
1657 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
1658 if (ap->sin_port == 0)
1659 ap->sin_port = htons(NFS_PORT);
1663 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
1664 if (ap->sin6_port == 0)
1665 ap->sin6_port = htons(NFS_PORT);
1672 * Validate NFSv4 mount options
1674 static int nfs4_validate_mount_data(void *options,
1675 struct nfs_parsed_mount_data *args,
1676 const char *dev_name)
1678 struct sockaddr_in *ap;
1679 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
1682 memset(args, 0, sizeof(*args));
1687 args->rsize = NFS_MAX_FILE_IO_SIZE;
1688 args->wsize = NFS_MAX_FILE_IO_SIZE;
1692 args->acregmax = 60;
1693 args->acdirmin = 30;
1694 args->acdirmax = 60;
1695 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1697 switch (data->version) {
1699 ap = (struct sockaddr_in *)&args->nfs_server.address;
1700 if (data->host_addrlen > sizeof(args->nfs_server.address))
1701 goto out_no_address;
1702 if (data->host_addrlen == 0)
1703 goto out_no_address;
1704 args->nfs_server.addrlen = data->host_addrlen;
1705 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
1707 if (!nfs_verify_server_address((struct sockaddr *)
1708 &args->nfs_server.address))
1709 goto out_no_address;
1711 nfs4_default_port((struct sockaddr *)
1712 &args->nfs_server.address);
1714 switch (data->auth_flavourlen) {
1716 args->auth_flavors[0] = RPC_AUTH_UNIX;
1719 if (copy_from_user(&args->auth_flavors[0],
1720 data->auth_flavours,
1721 sizeof(args->auth_flavors[0])))
1725 goto out_inval_auth;
1728 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
1731 args->nfs_server.hostname = c;
1733 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
1736 args->nfs_server.export_path = c;
1737 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
1739 c = strndup_user(data->client_addr.data, 16);
1742 args->client_address = c;
1745 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
1749 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
1750 args->rsize = data->rsize;
1751 args->wsize = data->wsize;
1752 args->timeo = data->timeo;
1753 args->retrans = data->retrans;
1754 args->acregmin = data->acregmin;
1755 args->acregmax = data->acregmax;
1756 args->acdirmin = data->acdirmin;
1757 args->acdirmax = data->acdirmax;
1758 args->nfs_server.protocol = data->proto;
1764 if (nfs_parse_mount_options((char *)options, args) == 0)
1767 if (!nfs_verify_server_address((struct sockaddr *)
1768 &args->nfs_server.address))
1771 nfs4_default_port((struct sockaddr *)
1772 &args->nfs_server.address);
1774 switch (args->auth_flavor_len) {
1776 args->auth_flavors[0] = RPC_AUTH_UNIX;
1781 goto out_inval_auth;
1785 * Split "dev_name" into "hostname:mntpath".
1787 c = strchr(dev_name, ':');
1790 /* while calculating len, pretend ':' is '\0' */
1792 if (len > NFS4_MAXNAMLEN)
1793 return -ENAMETOOLONG;
1794 /* N.B. caller will free nfs_server.hostname in all cases */
1795 args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
1797 c++; /* step over the ':' */
1799 if (len > NFS4_MAXPATHLEN)
1800 return -ENAMETOOLONG;
1801 args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
1803 dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
1805 if (args->client_address == NULL)
1806 goto out_no_client_address;
1815 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
1819 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
1820 data->auth_flavourlen);
1824 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
1827 out_no_client_address:
1828 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
1833 * Get the superblock for an NFS4 mountpoint
1835 static int nfs4_get_sb(struct file_system_type *fs_type,
1836 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1838 struct nfs_parsed_mount_data data;
1839 struct super_block *s;
1840 struct nfs_server *server;
1841 struct nfs_fh mntfh;
1842 struct dentry *mntroot;
1843 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1844 struct nfs_sb_mountdata sb_mntdata = {
1849 /* Validate the mount data */
1850 error = nfs4_validate_mount_data(raw_data, &data, dev_name);
1854 /* Get a volume representation */
1855 server = nfs4_create_server(&data, &mntfh);
1856 if (IS_ERR(server)) {
1857 error = PTR_ERR(server);
1860 sb_mntdata.server = server;
1862 if (server->flags & NFS4_MOUNT_UNSHARED)
1863 compare_super = NULL;
1865 /* Get a superblock - note that we may end up sharing one that already exists */
1866 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1872 if (s->s_fs_info != server) {
1873 nfs_free_server(server);
1878 /* initial superblock/root creation */
1882 mntroot = nfs4_get_root(s, &mntfh);
1883 if (IS_ERR(mntroot)) {
1884 error = PTR_ERR(mntroot);
1885 goto error_splat_super;
1888 s->s_flags |= MS_ACTIVE;
1890 mnt->mnt_root = mntroot;
1894 kfree(data.client_address);
1895 kfree(data.nfs_server.export_path);
1896 kfree(data.nfs_server.hostname);
1900 nfs_free_server(server);
1904 up_write(&s->s_umount);
1905 deactivate_super(s);
1909 static void nfs4_kill_super(struct super_block *sb)
1911 struct nfs_server *server = NFS_SB(sb);
1913 nfs_return_all_delegations(sb);
1914 kill_anon_super(sb);
1916 nfs4_renewd_prepare_shutdown(server);
1917 nfs_free_server(server);
1921 * Clone an NFS4 server record on xdev traversal (FSID-change)
1923 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
1924 const char *dev_name, void *raw_data,
1925 struct vfsmount *mnt)
1927 struct nfs_clone_mount *data = raw_data;
1928 struct super_block *s;
1929 struct nfs_server *server;
1930 struct dentry *mntroot;
1931 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1932 struct nfs_sb_mountdata sb_mntdata = {
1937 dprintk("--> nfs4_xdev_get_sb()\n");
1939 /* create a new volume representation */
1940 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1941 if (IS_ERR(server)) {
1942 error = PTR_ERR(server);
1943 goto out_err_noserver;
1945 sb_mntdata.server = server;
1947 if (server->flags & NFS4_MOUNT_UNSHARED)
1948 compare_super = NULL;
1950 /* Get a superblock - note that we may end up sharing one that already exists */
1951 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1957 if (s->s_fs_info != server) {
1958 nfs_free_server(server);
1963 /* initial superblock/root creation */
1964 nfs4_clone_super(s, data->sb);
1967 mntroot = nfs4_get_root(s, data->fh);
1968 if (IS_ERR(mntroot)) {
1969 error = PTR_ERR(mntroot);
1970 goto error_splat_super;
1972 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1975 goto error_splat_super;
1978 s->s_flags |= MS_ACTIVE;
1980 mnt->mnt_root = mntroot;
1982 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
1986 nfs_free_server(server);
1988 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
1992 up_write(&s->s_umount);
1993 deactivate_super(s);
1994 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
1999 * Create an NFS4 server record on referral traversal
2001 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2002 const char *dev_name, void *raw_data,
2003 struct vfsmount *mnt)
2005 struct nfs_clone_mount *data = raw_data;
2006 struct super_block *s;
2007 struct nfs_server *server;
2008 struct dentry *mntroot;
2009 struct nfs_fh mntfh;
2010 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2011 struct nfs_sb_mountdata sb_mntdata = {
2016 dprintk("--> nfs4_referral_get_sb()\n");
2018 /* create a new volume representation */
2019 server = nfs4_create_referral_server(data, &mntfh);
2020 if (IS_ERR(server)) {
2021 error = PTR_ERR(server);
2022 goto out_err_noserver;
2024 sb_mntdata.server = server;
2026 if (server->flags & NFS4_MOUNT_UNSHARED)
2027 compare_super = NULL;
2029 /* Get a superblock - note that we may end up sharing one that already exists */
2030 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2036 if (s->s_fs_info != server) {
2037 nfs_free_server(server);
2042 /* initial superblock/root creation */
2046 mntroot = nfs4_get_root(s, &mntfh);
2047 if (IS_ERR(mntroot)) {
2048 error = PTR_ERR(mntroot);
2049 goto error_splat_super;
2051 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2054 goto error_splat_super;
2057 s->s_flags |= MS_ACTIVE;
2059 mnt->mnt_root = mntroot;
2061 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2065 nfs_free_server(server);
2067 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2071 up_write(&s->s_umount);
2072 deactivate_super(s);
2073 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2077 #endif /* CONFIG_NFS_V4 */